9912721173 has 32 divisors (see below), whose sum is σ = 14206934400. Its totient is φ = 6129478656.

The previous prime is 9912721151. The next prime is 9912721193. The reversal of 9912721173 is 3711272199.

It is a happy number.

9912721173 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 9912721173 - 2⁵ = 9912721141 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9912721103) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 561363 + ... + 578751.

It is an arithmetic number, because the mean of its divisors is an integer number (443966700).

Almost surely, 2^9912721173 is an apocalyptic number.

It is an amenable number.

9912721173 is a deficient number, since it is larger than the sum of its proper divisors (4294213227).

9912721173 is a wasteful number, since it uses less digits than its factorization.

9912721173 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17621.

The product of its digits is 47628, while the sum is 42.

The square root of 9912721173 is about 99562.6494876467. The cubic root of 9912721173 is about 2148.1484815554.

The spelling of 9912721173 in words is "nine billion, nine hundred twelve million, seven hundred twenty-one thousand, one hundred seventy-three".